Social-media is quick, interactive, and always changing. That’s what makes it fun for people, but it also creates problems for companies. Most organizations want to manage how they talk to the public and avoid any controversy, but Social-media is open and unpredictable. That’s why companies make Social-media policies-to guide how their employees behave online. But making a good Social-media policy is not easy. It’s important to understand how different platforms like Twitter, Facebook, or YouTube actually work-what they allow people to do. These features are called “affordances” by researchers. For example; Twitter is fast and good for short updates, Facebook allows more detailed sharing, and YouTube is all about videos. Each platform has its own style, and users behave differently on each. This paper starts by explaining these differences. Then it looks at why companies need Social-media policies not just to stop people from saying wrong things; but also, to protect the company’s image and promote honest and respectful communication.